Global patent index - EP 1030453 A1

EP 1030453 A1 2000-08-23 - A method for reducing transition time in a PLL frequency synthesizer having a programmable frequency divider

Title (en)

A method for reducing transition time in a PLL frequency synthesizer having a programmable frequency divider

Title (de)

Methode zur Verringerung der Einschwingzeit eines PLL-Frequenzsynthetisierers mit progammierbaren Frequenzteiler

Title (fr)

Méthode pour réduire le temps de synchronisation d'un synthétiseur de fréquence à PLL avec diviseur de fréquence programmable

Publication

EP 1030453 A1 (EN)

Application

EP 99100953 A

Priority

EP 99100953 A

Abstract (en)

For reducing the transition time which is required to switch a PLL circuit comprising a programmable frequency divider (5) from one frequency to another at least one or a certain sequence of additional intermediate divider steps are selected such that the final frequency is approached faster. Appropriate additional intermediate divider steps and their respective time duration are selected from a look-up table or defined according to an algorithm depending on the respectively required frequency change and in consideration of the response of the PLL upon divider switching. No additional or modified hardware is required. The invention is applicable for all kinds of systems comprising programmable PLL circuits. <IMAGE>

IPC 1-7 (main, further and additional classification)

H03L 7/197

IPC 8 full level (invention and additional information)

H03L 7/197 (2006.01)

CPC (invention and additional information)

H03L 7/1972 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 1030453 A1 20000823

INPADOC legal status

2003-03-05 [18D] DEEMED TO BE WITHDRAWN

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- Effective date: 20020827

2002-05-29 [17Q] FIRST EXAMINATION REPORT

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- Effective date: 20020415

2001-05-09 [AKX] PAYMENT OF DESIGNATION FEES

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2001-03-21 [17P] REQUEST FOR EXAMINATION FILED

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- Effective date: 20010123

2000-08-23 [AK] DESIGNATED CONTRACTING STATES:

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- Designated State(s): DE FR GB

2000-08-23 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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